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Infants Young Adults Elderly Wake after sleep onset 90% 75-85% NREM stage 1 Quiet sleep 2-5% 5-8% NREM stage 2 Quiet sleep 45-55% 57-67% NREM stage 3&4 Quiet sleep 13-23% 6-17% REM sleep 50% 20-25% 17-20% Stage REM:NREM ratio 50:50 20:80 20:80 Time of REM:NREM cycle

45-60 min 90-110 min 90-110 min

Total sleep time 14-16 hours 7-8 hours 7 hours

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